Guys,
i recently bought a used OS 40LA,
and today i fired it up.

I used an APC 11x6 prop,
10% N Cool power fuel.

My problem is that when i put my airplane vertical by hand to try and see if the engine stalls,
it actually did.

No matter how much i opened the high speed needle valve,
from 2 turns to 3-1/2 from fully closed.

Also,
the engine came without the needle holder,
but because i wanted to try it TODAY
i glued a piece of wood on the firewall and installed the needle valve there,with a self taping srew.

Also,
i saw that the needle valve is approximately 5 fingers higher than the carb position.
Does that affect the engine?

Last,
idle is perfect,also the WOT and transition.
But when i grab the ARF and put it in vertical position,
it runs and then stalls.[:@]